Water-tube boiler.



No. 759,544. I PATENTED MAY 10, 1904. J. J. O'BRIEN.

WATER TUBE BOILER.

APPLICATION FILED MAB.12| 1904. N0 MODEL. 2 SHE ETS-SHBET 1.

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ATTEST INVENTOR.

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No. 759,544. PATENTED MAY 10, 1904. J. I. O'BRIEN. WATER TUBE BOILER.

APPLIOATION FILED MAR,12, 1904.

N0 MODEL. 2 SHBETSSHEET 2.

FEGIY.

INVENTOR.

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UNITED STATES Patented May 10, 1904.

PATENT OFFICE.

JOHN J. OBRIEN, OF ST. LOUIS, MISSOURI, ASSIGNOR TO JOHN OBRIEN BOILER WORKS COMPANY, OF ST. LOUIS, MISSOURI, A CORPORATION.

WATER-TUBE BOILER.

SPECIFICATION forming part of Letters Patent No. 759,544, dated May 10, 1904.

Application filed March 12,1904. Serial NO. 197,755. (N0 model.)

To all whom it may concern.-

Be it known that 1, JOHN J. OBRIEN, a citizen of the United States, residing in the city of St. Louis, in the State of Missouri, have invented certain new and useful Improvements in Water-Tube Boilers, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification.

My invention relates to water-tube boilers of the description set forth in Letters Patent of the United States No. 731,211, issued to the John OBrien Boiler Works Company June 16, 1903, the object of the present invention being to so construct a water-tube steam-boiler that there will be induced therein a more rapid circulation of water through the main tubes, water-legs, and boiler-shell and also a constantly contiuued free circulation of water between the front and rear manifolds of the boiler to return from the rear manifold to the boiler-shell, thereby insuring an increase in the generation of steam and less saturation of the steam generated.

The invention consists in features of novelty hereinafter fully described, and pointed out in the claims.

Figure I is a side elevation of my boiler. Fig. II is an enlarged vertical section taken on line II II, Fig. III, through the lower end of the front Water-leg, one of the down-pipes leading from said leg, and the front manifold with ends of one of the lower water-tubes and front-and rear manifold connecting-pipes shown in elevation. Fig. III isa horizontal section taken on line III III, Fig. II. Fig. IV is a similar view to Fig. II, showing a modification. Fig. V is a horizontal section taken on line V V, Fig. IV.

1 designates the boiler-shell; 2 the rear water-leg, and 3 the forward water-leg, both of which have communication with the interior of said shell.

4 designates the water-tubes positioned between the water-legs 2 and 3 and having communication therewith.

5 is a rear manifold that is arranged in com munication with the boiler-shell 1 through the medium of risers 6.

7 is a front manifold, and 8 designates pipes connecting the forward and rear manifolds.

9 designates nipples connected to the lower end of the front water-leg 3 beneath the line of the lower water-tubes 4. I have shown three of these nipples, (see Fig. III;) but they may be of any other desirable number.

10 designates down-pipes that are positioned between the nipples 9 and front manifold 7 to, in connection with said nipples, provide communication between the front water-leg and said manifold.

In Figs. IV and V, I have shown a modification in which 3 designates the front waterleg, and 4 the water-tubes. In this modification the nipples 9 are attached to the inner wall of the front Water-leg instead of being positioned directly beneath said leg, and the down-pipes 10 and front manifold 7 are conneoted to these nipples in the same manner as in the previously-described construction. It will be seen that in this modification the communication between the members referred to is essentially the same as in the first-described form of construction.

In the use of the boiler there is a constant circulation of water in a rearward direction through the boiler-shell 1 to the rear waterleg 2 and downwardly therethrough to enter the water-tubes 4 and pass forwardly to the front water-leg 3 and upwardly through said front water-leg to the boiler-shell without any interference, the circulation taking place in the same degree from the lower row of watertubes as from the rows surmounting it. At

the same time that the circulation takes place through the parts of the boiler just referred to a downward circulation from the lower end of the front water leg 3 takes place through the nipples 9 and down-pipes 10 to the front manifold 7 to convey the water from said leg to the manifold and therefrom to the connecting-pipes 8 into the rear manifold 5 and therefrom through the risers into the shell of the boiler to pass rearwardly to the rear water-leg, thereby following the same course of flow as that described in connection with the water that traverses the water-tubes 4, the waterlegs, and boiler-shell only. By

thus providing for the two separate flows of water in the boiler the water that passes upwardly from the water-tubes through the front water-leg is drawn away and separated from the water descending to the manifolds, and the steam confined in the water is necessarily lessened in pressure at the forward ends of the boiler-tubes, thereby inducing a more rapid circulation of water through the the water-tubes to insure an increase in the generation of the steam and secure less saturation of the steam. At the same time the circulation throughout the boiler is greatly increased, due to the freedom of circulation of a portion of the water downwardly to and through the manifolds and their connectingpipes, without the least interference with each course to the manifold, owing to the circulation being entirely independent of the JOHN J. OBRIEN.

In presence of NELLIE V. ALEXANDER, E. S. KNIGHT. 

